KR101489967B1 - System and method for updating presence satus information - Google Patents

Abstract

The present invention relates to a presence service system and method capable of updating presence status information. According to an embodiment of the present invention, a terminal using a presence service includes a memory for storing a first address book, A presence server for providing a presence service to the presence server, the presence server for requesting modification of a second address book stored in the presence server to correspond to the modified first address book, And a controller for setting an identifier for the first address book corresponding to the received address book identifier when the first address book and the second address book are synchronized from the first address book and the second address book, And is received from the presence server at every synchronization according to the modification of the address book If the synchronization of the first address book stored in the terminal and the second address book stored in the presence server is maintained using the address book identifier, the control unit, using the presence status mask received from the presence server, And updates status information of at least one terminal included in the address book.

Presence service, Presence status information, Address book, Synchronization

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a presence system,

The present invention relates to presence service, and more particularly, to a presence service system and method capable of updating presence status information.

Generally, a presence service receives and stores presence information representing a possibility of communication, and then transmits the presence information when a request is received from a user registered as a buddy.

The presence service includes means of communication such as instant messaging (IM), VoIP, mobile phone, e-mail, and the willingness to communicate, such as urgent or always e-mail transmission, Communication capabilities and characteristics such as various languages available.

Typically, the presence service is provided as an application service such as a Buddy List-based messenger using SIP (Session Initiation Protocol, IETF RFC 3261) or Push-to-talk over Cellular (PoC).

The buddy list is essential information for the presence service. The buddy list is interlocked with the presence server, and receives status information (presence information) of users registered in the buddy list from the presence server and displays status information of users registered in the list, such as online, offline, So that the user who requests the presence service can know the status of the presence service.

The communication standard for delivery of the presence information conforms to the following standard.

1) Presence information transmission specification: 3GPP TS24.141 (Presence service using IP Multimedia Core Network Subsystem, Stage 3).

2) Notification and format of presence status information: RFC 3903 (SIP Extension for Event State Publication), RFC 3863 (Presence Infromation Data Format), DRAFT-IET F-SIMPLE-RPID (Rich Presence Extension to PIDF).

3) A specification for requesting presence status information, authentication for request, request information, RFC 3265 (SIP Specific Event Notification), RFC 3856 (A Presence Event Package), DRAFT-IETF-SIMPLE-PRESENCE-RULES Presence Authorization Rules).

4) A message and information format specification that a buddy information requester (watcher) requests a presence status for a specific subscriber, RFC 3857 (A Watcher Information Event Template - Package for the SIP), and RFC 3858 (XML based format for Watcher Information).

5) Message registration and requesting buddy list specification: DRAFT-IETF-SIMPLE-EVENT-LIST (SIP Event Notification Extension for Resource list).

6) Message specification for adding, modifying and deleting presence information: DRAFT-IETF-SIMPLE-XCAP, DRAFT-IETF-SIMPLE-XCAP-PIDF-MANIPULATION-USAGE (XCAP Usage for Manipulating Presence Document Contents ), DRAFT-IETF-SIMPLE-XCAP-LIST-USAGE (XML Format for Presenting Resource Lists).

7) Specification: RFC 3680 (SIP Event Packages for Registration) that notifies the registration event of the terminal to the soft switch with the location registration function.

Hereinafter, a presence service system conforming to the communication standard for delivery of the presence information will be briefly described with reference to FIG. 1 to FIG. 3, and the problem of updating the presence status information in the presence service system according to the related art will be described.

FIG. 1 is a block diagram of a conventional presence service system according to the related art, and shows an example of a conventional presence service system. 1, the unified presence service system according to the related art has a function of registration, authentication, and call processing service for the terminal 70, and has a function of registering, unregistered state, A soft switch 20 for transferring information related to the status of the mobile communication terminal 20 upon receiving a request from the integrated presence server 60, and a multi-call application service by transmitting and receiving a call connection message in cooperation with the soft switch 20 . In addition, the integrated presence service system includes a call application server 30 for receiving information on a call application service status of the presence subscriber from the integrated presence server 60, A media server 40 for providing multimedia resource functions such as video and audio guidance transmission, video and voice message recording, and DTMF (Dual Tone Multi Frequency) collection according to control, a server-client based A data application server 50 for delivering the information when a presence service status of the presence subscriber is requested from the integrated presence server 60, a call application server 30, A data application server 50, a softswitch 20 and a terminal 70. The communication application server 30, the data application server 30, (E.g., Centrix, video education), data application service status (e.g., game, messaging), and registration status and call status of the user via the network interface 50 and the soft switch 20 And provides an integrated presence service that provides management of the network-based address book (buddy list information and profile) through the interface with the terminal 70 by providing the status of specific contents (for example, stock price, sports score) A server 60 and a terminal 70 that provides a communication service such as a basic video call and a communication application service provided in a packet network and can use a multiservice by loading a client to receive a content type data application service.

The soft switch 20 receives various terminals of the packet network to perform a call processing function, interlocks with various application servers, and provides a registration status and a busy status to an integrated presence server 60. In addition, the call application server 30 provides a call-based supplementary service such as a multimedia centrix, a video education and the like to the integrated presence server 60 in response to receiving an application call connection request from the soft switch 20, State. The media server 40 is also connected to the media server 40 under the control of the communication application server 30 to set up a call connection with the terminal and to transmit video and audio media, DTMF collection, text-to- And performs automatic speech recognition and video recording.

The data application server 50 provides a variety of services such as games and messaging to the video terminal 70 through data connection between the server and the client on the basis of the internet protocol and transmits the service status of the data application to the integrated presence server 60 Lt; / RTI > In addition, the data application server 50 registers the specific content as a presence client, periodically transmits the change status and information of the content to the integrated presence server 60, and informs the buddy (subscriber) Provide real time.

The integrated presence server 60 requests and collects the consolidated presence status of the subscriber in cooperation with the soft switch 20, the call application server 30, the data application server 50 and the terminal 70, And an integrated presence server 60 that provides an integrated presence service to the multi-service subscriber.

At this time, the soft switch 20 transmits and receives the service status of the presence subscriber by interworking with each server based on the SIP protocol. The soft switch 20 includes a Presence User (PUA) The call application server 30 and the data application server 50 each have a PUA function for providing a call application state and a data application state of a presence subscriber or a requestor The presence server 60 for collecting and delivering the aggregate presence functions from them provides a presence agent (Watcher) and a PA (Presence Agent) that provides both the provider (PUA) ).

On the other hand, the integrated presence server 60 integrating and providing multiple application service statuses includes a presence and profile information of presence presenters, a watcher of subscriber status information, a database for storing and managing buddy list information per subscriber, (61), a function of judging the level of disclosure according to the type of information when requesting information from the network, and collecting the information according to the authority of each requester and delivering the information to the requester, A data application server 50, and a soft application server 50 in accordance with the presence-based SIP-based protocol standard. The logic processing unit 62 performs a function of determining the validity of the subscriber- And a network connection unit 63 for transmitting / receiving presence information to / from the switch 20, the terminal 70, and the like.

Here, the database 61 stores information on statuses of the multiple services for the presence subscriber, and individual buddies and buddy lists. In addition, the logic processor 62 determines the level of information disclosure according to the type of status at the time of requesting information from the network based on the presence subscriber status information in the database, and transmits the information to the requestor according to the requestor-specific authority . In addition, the network connection unit 63 transmits and receives information to and from the various servers through the transmission of presence information and the SIP-based protocol.

The terminal 70 is connected to the integrated presence server 60 to perform buddy list management such as requesting a status change of a friend, receiving a change event, displaying on a GUI (Graphic User Interface), adding a friend, A presence client unit 71 for invoking multiple applications installed in the terminal through an integrated interface, a video call transmission / reception function, and a call connection function when a call connection request is made through a presence client A data connection application 72 for performing a service function such as connection, execution, and termination with a server by driving a client when a data application connection is requested through the presence client 71 in cooperation with the data application server 50; A signal protocol for interworking with the client unit 73 and the softswitch 20 on the packet network, the integrated presence server 60, and a protocol for interworking with the data application server 50 An Internet protocol, a media server 40 and a network connection unit 74 equipped with a real-time transmission protocol for interworking with other terminals.

2 is a flowchart illustrating a method of providing a multi-application service state in a video terminal according to the related art. Referring to FIG. 2, a presence client 71 is first activated on the terminal 70 and an initialization procedure is performed (201). Thereafter, the integrated presence server 60 requests 203 a notification of the buddy's current status and status change for each buddy in the subscriber's address book. Thereafter, after receiving the notification of the corresponding state (205), it analyzes (207) and displays the corresponding GUI icon (21) according to the integrated state value for each state of each buddy (209). Thereafter, when the terminal user views the status of the corresponding buddy, selects a buddy, selects a relevant service, and executes the corresponding service (213). Thereafter, when the execution of the service is completed, the process proceeds to step 202 or ends.

Such an integrated presence service system according to the related art allows a terminal subscriber who can install and use a multi-service client in a complex communication environment of a packet network to select a communication system according to a communication service state, thereby enabling efficient and convenient use of the network service.

3 is a flowchart illustrating a method for providing a multi-application service state in an integrated presence server according to the related art. Referring to FIG. 3, the integrated presence server first performs an initialization procedure (301). Thereafter, upon receipt of the status information of another presence subscriber from an arbitrary terminal (presence subscriber) (303), a predetermined authentication procedure is performed to verify the authority (305). If the verification result 305 is a valid request, the multi-application service status information of the other presence subscriber is requested to the interworking server 307, and the corresponding status information is received (309).

After classifying the received status information according to the type of the received status information, the database is updated, and the request information is aggregated (311) and transmitted to the requested presence subscriber (313). Through this process, the multiple application service status information can be provided to a plurality of video terminals.

The presence service according to the related art in the integrated presence service system according to the related art shown in FIG. 1 to FIG. 3 manages the login / logoff state of the user to the instant messenger service, so that the instant messenger service (3GPP IMPP: Instant Messaging and Presence Protocol). In this case, the presence update information is transmitted and received in the XML (Extensible Markup Language) or RDF (Resource Description Framework) format. The presence update information includes a user status, a contact, a memo, and time information.

4 is a diagram showing an example of presence status information created in an XML format, and has a data amount of about several hundred bytes for one item of a buddy list.

Therefore, since the presence update information is formatted in text format such as XML or RDF, the amount of data to be transmitted is large. Therefore, there is a problem that it takes a lot of time to interpret the text to analyze the presence status information.

Accordingly, an object of the present invention is to reduce the update frequency using XML and RDF when updating a state change of a buddy by using a synchronization method and a state mask using an identifier (Signature) of a terminal and a presence server address book, And a presence service system for updating the presence status information that can reduce the load of the presence status information analysis.

According to an embodiment of the present invention, a terminal using a presence service includes a memory for storing a first address book, and a presence server for providing the presence service when the stored first address book is modified, A presence client unit for requesting modification of a second address book stored in the presence server so as to correspond to the first address book and the second address book in response to the request when an address book identifier for synchronization of the first address book and the second address book is received from the presence server, And a controller for setting an identifier for the first address book corresponding to the received address book identifier, wherein the address book identifier is received from the presence server at every synchronization according to the modification of the first address book, The first address book stored in the terminal and the presence server If the synchronization of the second contacts holding, the control section updates the status information for at least one terminal included in the first address book, using the mask presence status received from the presence server.
According to another aspect of the present invention, there is provided a presence server for providing a presence service, the presence server comprising: a request for modification of a second address book stored in the presence server to correspond to a first address book modified in the terminal, The second address book corresponding to the modified first address book, generating an address book identifier for synchronizing the first address book and the second address book, and transmitting the generated address book identifier to the second address book, And a database for storing the modified second address book, wherein the logic processor generates the address book identifier at each synchronization according to the modification of the first address book, The first address book stored in the terminal and the presence server Stored when the synchronization of the second contacts held, the terminal updates the state information for the at least one terminal included in the first address book, using the mask presence status received from the presence server.
According to another aspect of the present invention, there is provided a method of using a presence service in a terminal, the method comprising: when a first address book stored in the terminal is modified, the presence server providing the presence service, The method comprising the steps of: requesting modification of a second address book stored in a server; receiving, in response to the request, an address book identifier for synchronization of the first address book and the second address book from the presence server, When the first address book stored in the terminal is synchronized with the second address book stored in the presence server using the address book identifier, the presence server identifies the first address book from the presence server Using the received presence status mask, at least one And updating the state information of the terminal of the first address book, wherein the address book identifier is received from the presence server at every synchronization according to the modification of the first address book.

delete

delete

delete

delete

delete

The presence service system and method for updating presence status information according to the present invention synchronizes an address book of a presence server with a terminal, reduces the transmission amount of update information required for updating by only using a presence status mask when state change of a buddy list is frequent, There is an effect of reducing the load of state information analysis.

The presence service system and method for updating the presence status information according to the present invention have an excellent effect that the amount of status information of about 300 bytes per item of the conventional buddy list can be reduced to several bytes by using the status mask.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, I will do it. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, to describe a presence service system and method for updating presence status information according to the present invention, a specific communication environment (packet network) is described as an example in order to enhance the convenience of explanation and facilitate the reader's understanding throughout the document do. However, the scope of application of the present invention is not limited to the packet network environment, and it can be easily applied to a communication system in which a presence service system is interworked by a person having ordinary knowledge.

The presence service system and method for updating the presence status information according to the present invention maintains synchronization with the address book of the terminal and the presence server using the address book identifier based on the time or the updated time generated in the address book of the terminal and the presence server , The amount of data is reduced by using only the presence status mask at the time of updating the presence information, and the load of the state information analysis is reduced.

5, a presence service system and method for updating presence status information according to the present invention includes a function of updating presence server information (e.g., address information) associated with each terminal 180 to the presence server 100 to reduce the amount of data transmitted for updating presence status information 111, 113, and 115 are provided in the database 110. Address book synchronization is performed between the presence server 100 and the terminal 180 according to an address book update event of the terminal 180. In the present invention, the address book of the presence server and the terminal has an identifier based on the generation time or the update time. The address book of the presence server and the terminal comprises an address book identifier record, an address sequence number record, and an address record.

The presence service system and method for updating the presence status information according to the present invention when the address book of the presence server and the terminal are synchronized can be achieved by using state information not only in the conventional state information notification format, .

The embodiment of the notification format using the presence status mask may be configured to include Event Presence in the NOTIFY of the SIP message and application / vnd-presence-mask information in the Content-Type. Figure 6 shows the presence status mask format according to the present invention. As shown in the figure, the presence status mask includes a start number, an end number, and a column of status information.

Hereinafter, with reference to FIG. 7 and FIG. 8, a method of updating a status information performed by the UE 180 in a presence service method for updating presence status information according to the present invention will be described in detail. FIG. 7 is a control flowchart illustrating an address book synchronization procedure of a terminal according to an embodiment of the present invention. FIG. 8 illustrates a synchronization procedure for adding and deleting an address book of a terminal, Fig.

7, in step 701, the terminal address book 191 is modified. In step 703, the terminal 180 registers presence server address lists 111, 113, and 115 for synchronization with the address book of the presence server 100 ). The presence server 100 updates the address book in response to the presence server address book modification request. At this time, the presence server 100 generates an address book identifier according to the address book generation time or the update time. Accordingly, if a response to the presence server address book modification is received together with the address book identifier from the presence server 100 in step 705, the terminal 180 updates the terminal address book identifier in response to the presence server address book identifier in step 707.

As described above, the presence service method for updating the presence status information according to the present invention according to the procedure shown in FIG. 7 includes the steps of generating the address book of the presence server 100 and the terminal 180 according to the modification of the address book of the terminal 180 And maintains synchronization with the address book of the presence server by using the generated address book identifier based on the updated time or the updated time.

Hereinafter, referring to FIG. 8, the operation of the terminal 180 for updating the presence status information in a state where synchronization between the terminal 180 and the presence server 100 is maintained will be described in detail with reference to FIG. First, in step 801, the terminal 180 drives the presence client 190 to perform an initialization procedure. After initialization, in step 803, the terminal 180 confirms the identifier of the terminal address book 191. In step 805, the presence server 100 notifies each buddy in the address book of the subscriber of the current status of the buddy and a status change notification Lt; / RTI > At this time, when requesting the status change notification, the terminal 180 transmits the address book identifier of the terminal in the notification request and transmits the address book identifier of the terminal and the address index of the selected buddy together when requesting the current state of the selected buddy .

Thereafter, in step 807, the terminal 180 receives a response to the status change notification request from the presence server 100, and determines whether a presence status mask has been received in step 809. If it is determined in step 809 that the presence status mask has been received, the flow advances to step 811 to update the buddy status according to the status mask. On the other hand, if it is determined in step 809 that the presence status mask has not been received, the flow advances to step 813 to analyze the status information notification signal, update the buddy status in step 815, and update the address book and address book identifier of the terminal in step 817 do. In step 819, the presence service is executed according to the presence status information updated.

Hereinafter, with reference to FIG. 9 and FIG. 10, a method of updating a status information performed by the presence server 100 in a presence service method for updating presence status information according to the present invention will be described in detail. 9 is a control flowchart illustrating an address book synchronization procedure of the presence server according to the present invention. The synchronization procedure according to addition and deletion of the address book of the presence server corresponding to the synchronization procedure according to the addition and deletion of the address book of the terminal shown in FIG. It is. 10 is a control flowchart illustrating a presence status information update procedure of the presence server corresponding to the presence status information update procedure of the presence client of the terminal shown in FIG.

9, in step 901, the presence server 100 receives a terminal address book modification request from the terminal 180 in step 901. In step 901, In response to the request, the presence server 100 modifies the address book 111, 113, and 115 of the database 110 in step 903, and proceeds to step 905 to generate an updated address book identifier. In step 907, the terminal 180 transmits a response to the address book modification request of the terminal 180 including the generated address book identifier.

9, the presence service method for updating the presence status information according to the present invention is a method for updating presence information of the presence server 100 and the terminal 180 according to an address book modification request of the terminal 180, And maintains synchronization with the address book of the presence server and the terminal using the generated address book identifier based on the updated time or the updated time.

Hereinafter, referring to FIG. 10, the operation of the presence server 100 for updating the presence status information in a state where synchronization between the terminal 180 and the presence server 100 is maintained as shown in FIG. 9 will be described in detail. First, in step 1001, the presence server 100 performs an initialization procedure. After the initialization, the presence server 100 proceeds to step 1005 where it receives a request for state information of another presence subscriber from the terminal 180 of an optional presence subscriber in step 1003, performs a predetermined authentication procedure, (180). If the validation result of step 1005 is a valid request, the presence server 100 proceeds to step 1007 to request status information of the other presence subscriber to the interworking servers, and receives the event related to the corresponding presence subscriber.

The presence server 100 proceeds to step 1011 and stores the received status information events in the corresponding address book 111, 113, and 115 of the database 110 and updates the received status information events. At this time, the presence server 100 generates and stores an address book identifier according to the generation time or the update time of the address book. In step 1013, the presence server 100 compares the address book identifier of the terminal received from the terminal 180 and the address book identifier stored in the address book. If the two address book identifiers are the same, the presence server 100 proceeds to step 1015, The process proceeds to step 1017.

The presence server 100 proceeds to step 1015 in accordance with the determination in step 1013. Since the address book of the terminal 180 is synchronized with the address book of the presence server 100, the presence server 100 generates status information of the buddy using only the presence status mask And transmits it to the terminal 180 (step 1019).

The presence server 100 proceeds to step 1017 according to the determination of step 1013. Since the address book of the terminal 180 and the address book of the presence server 100 are not synchronized with each other, And transmits it to the terminal 180 (step 1019).

9 and 10 according to the present invention, the presence service method for updating the presence status information according to the present invention includes synchronizing the address book of the terminal 180 and the address book of the presence server 100 And transmits the presence status information transmitted between the synchronized terminal 180 and the presence server 100 using the presence status mask so as to reduce the amount of update information required for updating the presence status information, Can be reduced.

FIG. 1 is a configuration diagram of an integrated presence service system according to the prior art,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

FIG. 3 is a flowchart illustrating a method for providing a multi-application service state in an integrated presence server according to the related art.

4 is a diagram showing an example of presence status information created in XML format,

5 is a configuration diagram of an integrated presence service system according to the present invention;

6 shows a presence status mask format according to the present invention,

FIG. 7 is a control flowchart illustrating an address book synchronization procedure of a presence server according to the present invention;

FIG. 8 is a control flowchart illustrating a presence status information update procedure of a presence client according to the present invention;

FIG. 9 is a control flowchart illustrating a synchronizing procedure when adding / deleting an address book of a presence server according to the present invention;

10 is a control flowchart illustrating a presence status information update procedure of a presence client according to the present invention.

Claims (16)

In a terminal using a presence service, A memory for storing a first address book, A presence client unit for requesting modification of a second address book stored in the presence server to correspond to the modified first address book to a presence server for providing the presence service when the stored first address book is modified, And a controller for setting an identifier for the first address book in response to the received address book identifier when the address book identifier for synchronizing the first address book and the second address book is received from the presence server in response to the request, ≪ / RTI & Wherein the address book identifier is received from the presence server at every synchronization according to the modification of the first address book and is synchronized with the first address book stored in the terminal and the second address book stored in the presence server using the address book identifier The control unit updates status information of at least one terminal included in the first address book using the presence status mask received from the presence server. The apparatus of claim 1, Requesting from the presence server information about the state of the at least one terminal included in the first address book using the set identifier, and includes index and presence status information corresponding to the at least one terminal from the presence server When the presence status mask is received, updates the status information for the at least one terminal corresponding to the index to the presence status information included in the presence status mask. 3. The method of claim 2, wherein the presence status mask comprises: Information on the smallest index among the indexes corresponding to the at least one terminal, information on the largest index among the indexes corresponding to the at least one terminal, information on the largest index among the smallest indexes, And the presence status information. 2. The method of claim 1, Wherein the second address book is created based on the modified time of the second address book. 1. A presence server for providing a presence service, Receiving a request for modification of a second address book stored in the presence server so as to correspond to a first address book modified in the terminal, from a terminal using the presence service; Modifying the second address book to correspond to the modified first address book, generating an address book identifier for synchronization of the first address book and the second address book, and transmitting the generated address book identifier to the terminal A logic processing unit for transmitting, And a database for storing the modified second address book, Wherein the logic processor generates the address book identifier at each synchronization according to the modification of the first address book and uses the address book identifier to synchronize the first address book stored in the terminal with the second address book stored in the presence server The MS updates state information of at least one MS included in the first address book using the presence status mask received from the presence server. 6. The apparatus according to claim 5, When a request for information on the state of at least one terminal included in the first address book is received from the terminal using the identifier set for the first address book in the terminal, Updating the second address book based on the presence status information of the at least one terminal, indexes corresponding to the at least one terminal, and the presence status information of the at least one terminal are included And transmits the created presence status mask to the terminal through the network interface. 7. The method of claim 6, wherein the presence status mask comprises: Information on the smallest index among the indexes corresponding to the at least one terminal, information on the largest index among the indexes corresponding to the at least one terminal, information on the largest index among the smallest indexes, And the presence server includes the presence status information. 6. The method of claim 5, Wherein the second address book is generated based on the modified time of the second address book. In a method for a terminal to use a presence service, Requesting a presence server providing the presence service to modify a second address book stored in the presence server to correspond to the modified first address book when the first address book stored in the terminal is modified; Setting an identifier for the first address book in response to the received address book identifier when the address book identifier for synchronization of the first address book and the second address book is received from the presence server in response to the request; , If the synchronization between the first address book stored in the terminal and the second address book stored in the presence server is maintained using the address book identifier and the presence status mask received from the presence server is used, And updating state information for at least one terminal, Wherein the address book identifier is received from the presence server at every synchronization according to the modification of the first address book. 10. The method of claim 9, The updating process includes: Requesting the presence server of information on the status of at least one terminal included in the first address book using the set identifier; When the presence status mask including the index and presence presence status information corresponding to the at least one terminal is received from the presence server, the status information for at least one terminal corresponding to the index is included in the presence status mask And updating the presence status information with the presence status information. 11. The method of claim 10, wherein the presence status mask comprises: Information on the smallest index among the indexes corresponding to the at least one terminal, information on the largest index among the indexes corresponding to the at least one terminal, information on the largest index among the smallest indexes, And the presence status information includes the presence status information. 10. The method of claim 9, Wherein the second address book is created based on the modified time of the second address book. In a method for a presence server to provide a presence service, Receiving from a terminal using the presence service a request for modification of a second address book stored in the presence server to correspond to a first address book modified by the terminal; Modifying the second address book to correspond to the modified first address book; Generating an address book identifier for synchronizing the first address book and the second address book; And transmitting the generated address book identifier to the terminal through a network interface, Wherein the address book identifier is generated at each synchronization according to the modification of the first address book, and when synchronization between the first address book stored in the terminal and the second address book stored in the presence server is maintained using the address book identifier, Wherein the presence server updates the status information of at least one terminal included in the first address book using the presence status mask received from the presence server. 14. The method of claim 13, If a request for information on the state of at least one terminal included in the first address book is received from the terminal using the identifier set for the first address book in the terminal, From a presence server, Updating the second address book based on the presence status information of the at least one terminal and generating the presence status mask including the index corresponding to the at least one terminal and the presence status information of the at least one terminal Process, And transmitting the generated presence status mask to the terminal through the network interface. 15. The method of claim 14, wherein the presence status mask comprises: Information on the smallest index among the indexes corresponding to the at least one terminal, information on the largest index among the indexes corresponding to the at least one terminal, information on the largest index among the smallest indexes, And the presence status information includes the presence status information. 14. The method of claim 13, Wherein the second address book is created based on the modified time of the second address book.

Images